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Stiffness question

  1. Nov 27, 2009 #1
    1. The problem statement, all variables and given/known data

    A spring has a relaxed length of 6 cm and a stiffness of 150 N/m. How much work must you do to change its length from 8 cm to 12 cm?


    2. Relevant equations

    1/2Ks,f - 1/2Ks,i

    3. The attempt at a solution

    1/2 Ks,f^2 - 1/2 Ks,i ^2
    1/2 (150)(0.06m)^2 - 1/2(150)(0.02)^2
    =0.24 N/m

    Am i right or is it supposed to be a negative value?
     
  2. jcsd
  3. Nov 27, 2009 #2

    Delphi51

    User Avatar
    Homework Helper

    Looks good to me! Definitely positive.
     
  4. Nov 28, 2009 #3
    Alright thanks
     
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